some additional information
caution, I'm not sure this is totally responsive to the OPs questions
https://www.wired.com/story/testing-boeings-new-engine/
excerpt follows
.... You might think the planet’s biggest engine runs hot enough to vaporize any ice bold enough to get near it. In fact, apart from the core, most of the engine is cold...
The basis of the engine design is not to exclude ice formation, but to make it tolerant to any ice that may form within it's innards.